Method for regulating and controlling stress relaxation and reprocessing molding temperature of vitrimer material by using content of dynamic bonds

A polymer material and stress relaxation technology, applied in the direction of plastic recycling, recycling technology, etc., can solve problems such as difficulty in releasing stress, inability to recycle, inability to reprocess and shape, and achieve the effect of accelerating application

Active Publication Date: 2019-12-31
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its three-dimensional cross-linked network structure, thermosetting polymers are difficult to release stress in the face of external strain, and at the same time, they cannot be reprocessed, and cannot be reprocessed and recycled like thermoplastic polymers or metals.

Method used

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  • Method for regulating and controlling stress relaxation and reprocessing molding temperature of vitrimer material by using content of dynamic bonds
  • Method for regulating and controlling stress relaxation and reprocessing molding temperature of vitrimer material by using content of dynamic bonds

Examples

Experimental program
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Effect test

Embodiment 1

[0019] The curing agent with different contents of carboxylic acid is used to react with epoxy resin to carry out cross-linking, so as to obtain dynamic carboxylate bond type glass epoxy polymers with different contents. The specific preparation process is as follows: bisphenol A glycidyl ether is used as a reactive monomer, and glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid and sebacic acid are used as curing agents respectively, 1 , 5,7-Triazabicyclo[4.4.0]dec-5-ene was used as a catalyst and reacted at 180°C for 4 hours to prepare glass-like epoxy polymers with different contents of dynamic carboxylate bonds. Glutaric acid-based glass-like epoxy polymers had the highest content of dynamic carboxylate linkages and sebacic acid-based glass-like epoxy polymers had the lowest content of dynamic carboxylate linkages. Although both the reactive monomer and the curing agent are double crown energy compounds, the hydroxyl group generated by the reaction of car...

Embodiment 2

[0021] Use epoxy monomers with aromatic disulfide bonds and epoxy monomers without aromatic disulfide bonds to react with epoxy curing agents with aromatic disulfide bonds at high temperatures to obtain aromatic disulfide bonds with different contents. Glass-like epoxy polymer. The specific preparation process is as follows, using dithiodiphenyl diglycidyl ether or bisphenol A diglycidyl ether as the epoxy monomer, dithiodiphenylamine as the epoxy curing agent, and reacting at 160 degrees for 3 hours, Prepare glass-like epoxy polymers with different contents of aromatic disulfide bonds (because the activity of aromatic disulfide bonds is higher, the exchange reaction does not require a catalyst, so there is no need to add a catalyst here). Among them, the content of aromatic disulfide bonds in the glass-like epoxy polymer based on dithiodiphenyl diglycidyl ether is higher than that of the glass-like epoxy polymer based on bisphenol A diglycidyl ether. Such as figure 2 It is...

Embodiment 3

[0023] The curing agent with different contents of carboxylic acid is used to react with epoxy resin to carry out cross-linking, so as to obtain dynamic carboxylate bond type glass epoxy polymers with different contents. The specific preparation process is as follows: bisphenol A glycidyl ether is used as a reactive monomer, and sebacic acid, azelaic acid, suberic acid, pimelic acid, adipic acid and glutaric acid are respectively used as curing agents, 1 , 5,7-Triazabicyclo[4.4.0]dec-5-ene was used as a catalyst and reacted at 180°C for 4 hours to prepare glass-like epoxy polymers with different contents of dynamic carboxylate bonds. The glass-like epoxy polymer based on sebacic acid had the lowest content of dynamic carboxylate linkages, and the glass-like epoxy polymer based on glutaric acid had the highest content of dynamic carboxylate linkages. Although both the reactive monomer and the curing agent are double crown energy compounds, the hydroxyl group generated by the re...

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Abstract

The invention proposes a method for regulating and controlling stress relaxation and reprocessing molding temperature of a vitrimer material by using the content of dynamic bonds. The vitrimer is a novel crosslinked polymer material, and the material uses a reversible reaction of the exchangeable dynamic bonds in a crosslinked network to realize stress relaxation and reprocessing molding of the material and maintain the integrity of the crosslinked network. The method accelerates the stress relaxation of the polymer and reduces the reprocessing molding temperature of the polymer by improving the content of the exchangeable dynamic bonds in the cross-linked network of the vitrimer material, and the method slows down the stress relaxation of the polymer and improves the reprocessing moldingtemperature of the polymer by reducing the content of the exchangeable dynamic bonds in the cross-linking network, so that the method realizes the purpose of regulating and controlling the stress relaxation and reprocessing molding temperature of the vitrimer material by using the content of the dynamic bonds; and the method proposed by the invention provides a novel way for regulation and controlof properties such as stress relaxation and reprocessing molding of the vitrimer, and promotes a practical application of such materials.

Description

technical field [0001] The invention belongs to the field of polymer materials, and relates to a method for regulating stress relaxation and reprocessing molding temperature of glass-like polymer materials through dynamic bond content. Background technique [0002] Thermosetting polymers (such as epoxy polymers) are widely used because of their excellent mechanical properties, excellent structural stability and good solvent resistance, and occupy an irreplaceable position in the fields of aerospace, rail transportation, electronic components and biological devices. important position. However, due to its three-dimensional cross-linked network structure, thermosetting polymers are difficult to release stress in the face of external strain, and at the same time, they cannot be reprocessed, and cannot be reprocessed and recycled like thermoplastic polymers or metals. Therefore, how to achieve stress relaxation and reprocessing of thermosetting polymers is still a big problem. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/42C08G59/50
CPCC08G59/4207C08G59/504Y02W30/62
Inventor 陈茂司鸿玮赵秀丽周琳吴冶平廖宏陈茂斌陈忠涛张银宇
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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